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(No Model.) I J. M. SHEW'.

D eokel for Paper Machines. No. 239,275. Patented March 22, last.

MFHERB. PHOTO-LITNOGRAPHER. WASHINGTDN. Du:

UNITED STATES PATENT OFFICE.

JAMES M. SHEW, OF PAPER MILLS, ASSIGNOR OF ONE-HALF TO GEORGE W. S.HOFFMAN, OF BALTIMORE, MARYLAND.

DECKEL FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 239,275, dated March22, 1881. Application filed February 17, 1881. (No model.)

To all whom it may concern:

Be it known that I, JAMES M. SHEW, of the village of Paper Mills, countyof Baltimore, and State of Maryland, have invented a new and usefulImprovement in Deckels for Paper- Machines, of which the following is aclear, full, and exact description, reference being had to theaccompanying drawings, making a part of this specification, in which-Figure 1 is a perspective view of a section of a deckel with myimprovement applied. Fig. 2 is a cross-section of the same.

My invention relates to machines for making paper; and it consists informinga groove on the face of the deckel which lies next to thewire-cloth.

To enable others skilled in the art to make and use my invention, I willproceed to describe the exact manner in which I have carried it out.

The deckels of a paper-machine, as hitherto constructed and as now inuse, consist, essentially, of asquare endless band of vulcanized rubber,each of the four sides of the deckel being fiat, and its form incross-section being rectangular.

,- "lhe object of the deckel is, first, to prevent the lateral spread ofthe pulp being mingled, as it is, with a large volume of water when itfirst comes in contact with the moving wirecloth; and, secondly, todetermine and limit the width of the paper web to be produced.

The deckels ofa paper-machine are kept in proper place by a number offlanged pulleys, two of which are attached to a movable arm, by whichthe deckels can be stretched to fit closely to the rolls over which thewire-cloth moves when the machine is in operation. It is a matter of thehighest importance that the inside edge of the deckel, which defines theedge of the paper, should lie close upon the Wire-cloth throughout thewhole length of that portion of the deckel which is moving in the samedirection'as the cloth. Any protuberance or other irregularity ofsurface of the deckel which prevents a perfect contact of the edge ofthe deckel with, and an unvarying pressure upon, the wire-cloth causesthe paper to be thinner at the edge than it should be, as a portion ofthe pulp is permitted to run under the deckel, thus leaving a raggededge to the web.

In the deckels as ordinarily made not only do the edges of that part ofthe deckel in contact with the wire-clothv press upon the cloth, but theentire surface of the deckel between these edges presses upon it, unlessprevented by some irregularity in the surface. Again, though the surfaceof a new deckel be perfectly even and level when first put into use, the

and shape to the deckels of paper machines that only the edges of theface next to the wireeloth shall come in direct contact with it. Iaccomplish this important object by making one or more grooves ordepressions in the face of the deckel and parallel with its entirelength. These grooves may be curved or angular, or of any other formwhich will allow the edges only of the deckel to impinge or press uponthe wire-cloth.

The grooving of the deckels may be effected by forming the groovesduring the process of manufacture; but I prefer to form a. curved grooveby grinding the face of an ordinary deckel with an ordinary grindstone,the face of which has the proper curvature to produce the desiredgroove. Thus a deckel which has by wear become unfit for use can be madeto do its work properly by grinding down its face to a flat surface andthen grinding a groove to the required size.

Referring to the accompanying drawings, A represents a section of adeckel provided with the groove a in its face and parallel with itsedges. Among other advantages of this form 0 of deckel over the ordinaryfiat deckelan advantage which will suggest itself to any practicalpaper-maker--is the decrease of friction and strain upon the wire-cloth,thereby iiicreasing the durability of both the deckel and 5 thewire-cloth.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

An improved deckel for paper-making ma- I00 chines, having the facewhich bears upon the wire-cloth grooved or depressed, substantially asand for the purpose set forth.

JAMES M. SHEW.

Witnesses:

J NO. B. BROWN, J OEL HoUsTEN.

